Vacuum cleaners, preferably transportable vacuum cleaners



Nov. 8, 1955 P. A. FlsKER VACUUM CLEANERS', PREFERABLY TRANSPORTABLEVACUUM CLEANERS Filed NOV. 9, 1950 4 Sheets-Sheet l Fig. 7 g

d .g/I/IHIIIIIIIIIL MIZ @00 o v H2L-l.:

IN VEN TOR.

P. A. FISKER Nov. 8, 1955 VACUUM CLEANERS, PREFERABLY TRANSPORTABLEVACUUM CLEANERS 4 Sheets-Sheet 2 Filed NOV. 9, 1950 l I l l f l llll Illl I l I lllllm INVENTOR.

BY Pfaff( AAsE/y f2s/fs@ ATTO/NEY Nov. s, 1955 P A, F-.SKE 2,722,994

VACUUM CLEANERS, PREFERABLY TRANSPORTABLE VACUUM CLEANERS Filed Nov. 9,1950 4 Sheets-Sheet 3 Fig. 5

I N VEN TOR. Feder ndewen/ffr www Arm/Mey Nov. 8, 1955 P. A. FlsKER2,722,994

VACUUM CLEANERS, PREFERABLY TRANSPORTABLE VACUUM CLEANERS 4 Sheetsheet 4Filed NOV. 9, 1950 Fig. 6

IN VEN TOR.

d ZV10 ,4 Waff/Vf Y VACUUIVI CLEANERS, PREFERABLY TRANSPRT- ABLE VACUUMCLEANERS Peder Andersen Fisher, Frederiksberg, near Copenhagen, Denmark,assigner to Aktieselskabet Fisher & Nielsen, Frederiksberg, nearCopenhagen, Denmark Application November 9, 1950, Serial No. 194,741

Claims priority, application Denmark November 24, 1949 16 Claims. (Cl.1825-58) This invention relates to vacuum cleaners. The vacuum cleanerin accordance with the invention is of the kind in which the vacuumandpressure-case is composed of at least three separable parts. The vacuumcleaner in accordance with the invention differs from the vacuumcleaners previously known, the vacuumand pressurecase consisting ofthree separable parts, in that its filter or filters are secured to aspecial filter holder having an air passage for each filler vand whichfiller holder is carried by an intermediate part which forms part of thewall in the vacuumand pressure-case of the vacuum cleaner and whichintermediate part can, by means of releasable clamping members beclamped either to the unit-carrying upper part or cover or upper partsor covers, constituting the upper part of the case, or to the dustcontainer constituting the lower part of the case, or to both theseparts of the`vacuumand pressure-case of the vacuum cleaner. Saidintermediate part which forms part of the wall in the vacuumandpressure-case of the vacuum cleaner entails the advantage that theinterme diate part together withthe unit-carrying upper ypart or coverof the vacuum cleaner can be released from the dust-container andassembled with the cover or covers can be placed aside while thedust-container is being emptied. When the intermediate part is securedon the dustcontainer together with the unit-carrying upper part or coverof the vacuum cleaner, the unit-carrying upper part or cover or upperparts or covers can be unlocked and removed from the intermediate partmounted on the dust-container with the result that access will beobtained to the clean side of the filter or filters which can be turnedinside out and shaken so that the dust drops down into thedust-container.

More exactly defined, the invention relates to a vacuum cleaner,preferably a transportable vacuum cleaner comprising a vacuumandpressure-case consisting of at least three parts, to wit, at least aunit carrying upper part or a cover and a filter carrying intermediatepart and a dust-container, into which the dust-filled airis sucked andwhere the intermediate part can by releasable clamping means be clampedin part to the upper part or cover Or upper parts r covers carrying theunit or units, in part to the dust-container, While at the same time theintermediate part is in fixed or releasable connection with a filterholder having at least one air passage which is closed with a filter. i'

The invention furthermore relates 'to different details of the vacuumcleaner here referred to.

ln the drawing, several embodiments of the vacuum cleaner in accordancewith the invention are shown.

Fig. l shows partly diagrammatically a vertical central section througha vacuum cleaner in accordance with the invention made with only oneunit-carrying upper part and only one filter, Y'

Fig. 2 also shows partly diagrammatically a vertical central sectionthrough a modified form of the-vacuum cleaner shown in Fig. l, l Y

Figs. 3 `and 4 show partlydiagrammatically a vertical ited States Patent0 2,722,994 atented Nov. 8, 1955 ICC centralv longitudinal sectionthrough a vacuum cleaner in accordance with the invention made with twounit carrying upper parts and two filters,

Figs. 5 and 6 likewise show diagrammatically a vertical longitudinalcentral section through a modified form of the vacuum cleaner shown inFig. 3, and

Figs. 7 and 8 show details of the vacuum cleaner shown in Figs. 5 and 6.

The reference numeral 1 in Fig. l designates the upper part or cover ofthe vacuum cleaner, which upper part or cover carries a motorandsuction-unit 2 and which, by diagrammatically indicated clamping members3, is clamped releasably to an intermediate part 4 which forms part ofthe wall in the outer case of the vacuum cleaner. The intermediate part4 is, by diagrammatically indicated clamping members 5, releasablyclamped to a dust-container 6 with a suction nozzle 7. The filter 8 isentirely or for the most part bag-shaped and can be shaken or turnedinside out, and partly encloses the unit 2. The lower part of theintermediate part 4 encloses a filter holder 9 which, in the embodimentshown, is shaped like a ring, and the filter S is at its widest endsecured to the hole in said ring so that the filter closes said hole.The filter holder 9 has at or in the vicinity of its outer edge aguiding a flange 10 or a corresponding collar, the outer side of whichhas the shape of the inside of the lower part of the intermediate part4, so that the filter holder 9 can. easily be inserted into theintermediate part. Below on the intermediate part 4 and below on theguiding fiange 10 of the filter holder 9, outwardly directed ringflanges 11 and 12 are provided which are enclosed by a ring 13 that issubstantially U-shaped in cross section and made of a yieldablematerial, preferably rubber, which ring 13 serves to assemble theintermediate part 4 and the filter holder 9 while at the same time, whenthe intermediate part is clamped to the dust-container, it serves toeffect a seal between the intermediate part and the dust-container. Thefilter holder 9, or preferably its guiding liange 10, carries either aguiding ring 14 or a number of guiding legs which serve to guide theintermediate part 4 during its mounting on the dust-container 6. On thefilter holder 9 there is provided, along the edge of the hole of thelatter, which hole is closed by the filter, an upwardly-directed ringcollar 15 to which the widest end of the filter 8 can be secured, e. g.by a clamping ling of metal. The filter 8 tapers downwardly towards thebottom and at its narrow end is closed by means of a closing plate 16which preferably consists of metal and which preferably has anupwardly-directed collar 17 along its edge to which the lower edge ofthe filter 8 can be secured. On the upper side of the closing plate 16 astrap or hoop 18, or alternatively a ring, a pin, or a similar member isprovided by which the closing plate can be moved up and down when thefilter is to be'shaken or turned inside out or both shaken and turnedinside out. In order to make room for the hoop 18, a suitable depression19 is provided in the lower part of the unit 2. Fig. 1 shows that theunit 2 is partly surrounded by the filter 3, the free filter surface ofwhich is comparatively large, the filter being in cross section shapedsubstantially like an M. The filter holder 9 carries, adjacent the holethat is closed by the filter, a number of upwardlydirected stays 20which are mounted preferably on the upwardly-directed ring collar 15 andthe upper ends of which are secured to a filter supporting ring 21 sothat in its operating position the filter 8 is held in distendetlcondition, in part by resting on said filter supporting ring 21 and inpart by the lower part of the motorand suctionunit resting against thebottom of the filter, and preferably resting on the upper side of the'closing plate 16 which closes the narrow end of the filter. A suctionhose can be coupled to the suction opening or suction nozzle 7 in thedust-container. Correspondingly, there is provided in the upper part orcover 1 a blowing-out opening or blowing-out nozzle (not shown) to whicha blowing hose can be coupled. By means of the clamping members in Fig.1 the intermediate part 4 kis releasably clamped to the dust-container 6so that the upper part or the cover 1, together with the intermediatepart 4, can be released from the dust-container 6 by release of theclamping members 5 and can be placed e. g. on a oor and be supported onthe closing plate 16 of the filter or on supporting legs which replacethe guiding ring 14, while the dust-coutainer 6 is being emptied. Thefact that the unit-carrying upper part 1 together with the intermediatepart can be placed as a unit on a floor and be supported on the closingplate 1:6 of the lter is in part due to the fact that the unit 2 restsagainst the closing plate, and in part to the upwardly-directed stays 20which keep the filter distended.

in Fig. 2 corresponding parts are designated by the same referencecharacters used in Fig. 1, and Fig. 2 differs from Fig. 1 only in thatthe filter holder 9'- and the intermediate part 4 have theoutwardly-directed ring anges 11 and 12 positioned in overlyingrelationship and locked together by the ring 13 which is U-shaped incross section and is made of a yieldablel material, preferably rubber.The ring 13 in Fig. 2 Serves to form a seal between the intermediatepart 4 and the upper part or the cover 1. The guiding ange on the filterholder 9 as shown in Fig. 2 is upwardly-directed and has a shapecorresponding to that of the inside of the upper part of theintermediate part 4. The ring collar i5 around the hole in the filter 9in Fig. 2 is downwardly-directed and the widest end of the filter 8 issecured around the ring collar 15, while the narrow end of the taperinglter shown in Fig. 2 is secured around the upwardly-directed ring collar17 on the closing plate 16 of the filter. The intermediate part 4 shownin Fig. 2 has at its. bottom end an outwardly-directed ring ange 22which secures a ring 23 which is substantially U-shaped in cross sectionand is made of a yieldable material, preferably rubber, which ring formsa seal between the intermediate part 4 and the dust container 6 whenthese parts are clamped together by the releasable clamping members 5which are, as was the case with the clamping members 3', only showndiagrammatically in the figure. At the lower part of the intermediatepart 4 a guiding ring 14 or a number of guiding legs are secured andserve to guide the intermediate part 4 during its mounting on thedust-container 6. If the clamping members 5' shown in Fig. 2 arereleased, the unit-carrying upper part and the intermediate part lcan asan assembled whole be placed on a floor in such position that they reston the closing plate 16 of the filter or on guidingV legs, oralternatively on a broader guiding ring 14, While the dust-container 6'is being empv tied.

In Figs. 3 and 4 corresponding parts are likewise designated by the samereference characters as in Fig. l, and the large-size vacuum cleaner orvacuum cleaner for industrial purposes shown in Figs. 3 and 4 in factdiffers from the vacuum cleaner shown in Fig. l only in beingconstructed with two unit-carrying uppery parts or covers and with twoilters which, as regardsy form and mounting, correspond completely tothe iilter 8 shown in Fig. 1. The dust-containery 6 shown in Figs. 3 and4 must be imagined as having an oval cross section or, alternatively, asubstantiallyv rectangular cross section with rounded corners, and theintermediate part 4 and the filter holder 9 are shaped so as' tocorrespond to they preferably oval cross-section of the dust-container6. The filter holder 9 is formed substantially in the shape of a platein which two' large circular holes are provided which have along theiredges an upwardly-directed ring-ange 15 to which the widest end of eachof the two filters S is secured. The guiding flange 10 on the filterholder 9 is shaped to conform to the shape of the inside of the lowerpart 4 of the intermediate part 4 and carries either a guiding ring 1401' a number of guiding legs which serve to guide the intermediate part4 during its mounting on the dust-container and which may besufiiciently long or high that they can serve as supports for theintermediate part when the latter is removed from the dust-container. Inits preferably plane upper side the intermediate part is provided withtwo holes in which the unit-carrying upper parts or covers 1 can beplaced so that there will be an air-tight seal against the intermediatepart, being secured by the releasable clamping members 3 which, in theembodiment shown in the ligure, consist of turnbuckles which arerotatably secured to the upper side of the intermediate part 4. Thelters 8 are in the operating position held in distended state in asimilar way to that shown in Fig. l, to wit, in part by the lower partof the unit 2 resting against the upper side of the closing plate 16 ofthe filter, and in part by the filter 8 resting on a. iilter supportingring 21, which is carried trom the filter holder 9 by a number ofupwardly-directed oblique stays 20 secured to the lter holder. When theunitcarrying upper parts or covers 1 are removed from the intermediatepart 4, access is obtained to the clean side of the filters 8 so thatthe filters can he shaken and turned inside out. When the intermediatepart 4, with the unit-carrying upper parts 1 mounted on it, is removedfrom the dust-container, the intermediate part 4 can be placed on a doorwith the lower edge of the supporting ring 4 resting on the door, whilethe dust-container is being emptied- Also in Figs. 5 and 6 correspondingparts are designated by the same reference characters as those used inFig. 1, only the most important details of the construction being,however, provided with reference characters because of the fact, thatthe vacuum ycleaner shown in Figs. 5 and 6 with two unit-carrying upperparts or covers 1 is constructed practically speaking in a mannersimilar to that of the large size vacuum cleaner or vacuum cleaner forindustrial purposes shown in Figs. 3 and 4. In Figs. 5 and 6 only theupper part ofthe dust-container 6 is shown, the latter being otherwiseconstructed in accordance with the dust-container structure shown inFigs. 3 and 4. Each of the iilters 8 isv in its operating position heldin distended state in part by the lower part of the unit 2 restingagainst the upper side. of the closing plate 16 of the iilter, and inpart by means of a filter supporting ring 21, which in the constructionshown in the figure is connected to a number, e. g. four,upwardly-directed rods 24, the lower ends of which are secured to ahorizontal frame 25 which is seen from above in Figs. 7 and 8 togetherwith the lter supporting rings 21 carried from it. Figs. 7 and 8 showthe upwardly-directed rods 24 in dotted lines and in their actualpositions between the supporting rings 2.1 and the frame 25, while forthe sake of clearness the rods 24 in Figs. 5 and 6 are shown somewhatdisplaced from their actual positions, while at the same time the frame25 in Figs. 5 and 6 is shown somewhat extended at the ends. Inconnection with the frame 25 there is at least one upwardly-projectingrod 26 which projects upwardly through a corresponding hole in thefilter holder 9 and a hole in the intermdiate part 4. The rod 26- can bemoved in downward and upward direction so that the frame 25 with thesupporting rings 21, and thereby the filters 8, can, bei shaken. Theframe 25 shown in Figs. 5 and 6, which is carried in suspended manner,is in its normal position, i. e. in the operation position of theiilters, and is supported by a pressure spring 27 which serves to keepthe frame 25 and thereby the filter vsupporting rings 21 in their raisedposition, so that the filters 8 are kept distended. The pressure spring27 shown in Fig. 5 is mounted around the rod 26 projecting, upwardlyfrom, the frame 25 in such a way that the lower endl of the spring, 27rests on the filter holder 9, while its upper end engages an extensionv28 or a member provided. on the-rod. 26. Fig. 5

shows that in addition to the spring 27, or as a substitute for saidspring, another pressure spring 29, maybe provided between the upperside of the intermediate part 4 and an extension 30 which is preferablyspherical, or a corresponding member on the top of the rod 26, whichextension or ball 30 or similar member is pressed downwardly when theiilters 8 are to be shaken. The upwardly-projecting rod 26, that isconnected to the frame 25 advantageously projects up through the filterholder 9 and the intermediate part 4 halfway between the unitcarryingupper parts or covers 1 mounted in the upper part of the intermediatepart, while at the same time the frame 25, as Viewed from above, has theshape of an H, the central bar 31 of which is at its middle connected tothe upwardly-projecting rod 26 of the frame, and the two side bars 32carry the upwardly-directed rods 24, the upper ends of which are securedto and carry the supporting rings 21 of the two filters.

The invention is not limited to the different embodiments of the vacuumcleaner shown on the drawing and described above. By way of example avacuum cleaner in accordance with the invention can be built which issimilar to the vacuum cleaner shown in Figs. 5 and 6, but with oneunit-carrying upper part of cover 1 and only one filter 8 which partlyencloses the unit 2, it being possible to imagine such a vacuum cleanerof a structure similar e. g. to that of Fig. 6 and the right end of Fig.5, whereby the two dotted lines 33 in Fig. 5 represent the left outerwall of the intermediate part 4 and thereby partly the left outer wallof the dust-container 6, corresponding completely to what is shown tothe extreme left in Fig. 5, where the intermediate part 4 at its bottomcarries the filter holder 9 and is by the releasable clamping member 5clamped to the dust-container 6. At the same time the left half of theframe 2S in Figs. 5-8 must be imagined cut away. Furthermore the frame25 in such a vacuum cleaner having only one unit-carrying upper part andonly one filter may be imagined as uniformly constructed at both ends,i. e. carrying at both ends an upwardly-projecting rod 26, as shown inFig. 5, so that the frame of said vacuum cleaner will have a carryingandshaking-device, acted upon by at least one pressure spring, at twoopposite sides of the sole filter 8 of the vacuum cleaner.

In Figs. l and 2 the upper edge of the dust-container 6, and thereby thelower part of the intermediate part 4 with the assembling ring 13 or 23and the guiding ring 14, may be mounted in such a manner that the rathernarrow guiding ring 14 shown in Figs. l and 2 will project below thebottom plate 16 of the filter so that, after the release of the clampingmembers S, the unit-carrying upperpart 1 and the intermediate part 4can, as an assembled whole, be placed on a oor. In the vacuum cleanershown in Figs. 3 and 4, and especially in Figs. 5 and 6, more than twounit-carrying upper parts or covers 1 may be used, and these are thenvadvantageously mounted in a ring or circle, the center of which asshown in Figs. 5 and 6, is advantageously placed so as to lie in theaxis of the rod 26. If more than two unit-carrying upper parts 1 areused, the cross sections of the intermediate part 4 and thedust-container must be shaped accordingly, e. g. so as to v be ofsubstantially circular cross section. The constructions shown in Fig. 2with an intermediate part 4 which carries the filter holder 9 at its topmay be applied also in vacuum cleaners in accordance with the inventionmade with two or more unit-carrying upper parts or covers, provided thatthe intermediate part 4 is shaped substantially as shown e. g. in Figs.3 and 4, but at its bottom is provided only with a sealing ring 23 and aguiding ring 14 similar to that shown in Fig. 2.

As indicated above, in all the embodiments of the vacuum cleaner of theinvention either the filter holder 9 or the intermediate part 4 carriesa guiding ring 14 or a number of guiding legs which serve to guide theintermediate piece 4 during its mounting on the dust-container 6. Saidguiding ring 14 or said guiding legs may, if it beprefverred, projectless far below the intermediate part than the bottom ofthe filter orilters. In this case the intermediate part 4 can, after having beenremoved from the dust-container 6, be put aside, e. g. on a oor, so asto rest on the bottom of the filter or the filters 8. Said guiding ring14 or said guiding legs may, if it be preferred, project suiciently farbelow the intermediate part that the latter, after having been removedfrom the dustcontainer, can be put aside, e. g. on a oor, without havingthe filter or filters 3 touch the surface upon which the intermediatepart 4 is placed.

What I claim is:

1. A vacuum cleaner, comprising a vacuumand pressure-case formed from anassembly consisting of at least one unit-carrying upper part, alter-carrying intermediate part, and a dust container lower part intowhich the dust-lled air is sucked, said parts of the case beingcompletely separable from one another but cooperating to form the caseas an integral, portable assembly, said intermediate part having theform of an annular jacket representing a substantial portion of theheight of vsaid case, a filter holder connected to said intermediatepart by at least one joint and being supported by said intermediate partby means of said joint, said iilter holder having at least one airpassage closed with a filter bag member, with the cavity of the memberfacing away from the dust container lower part of the case, and saidfilter member being adapted to be shaken and turned inside out andpartly enclosing the unit carried by the upper part, and saidintermediate part of the vacuumand pressure-case partly enclosing thefilter, first releasable clamping means connecting said intermediatepart to said lower part and second releasable clamping means connectingsaid intermediate part to said upper part.

2. A vacuum cleaner as defined in claim 1, wherein said filter bagmember is provided on the side facing said unit with means for turningsaid member inside out and shaking it.

3. A vacuum cleaner as defined in claim l, wherein the intermediate partand the lter holder are both provided at their bottoms with outwardlydirected ring anges which are enclosed by a ring consisting of ayieldable material, said ring clamping said intermediate part and saidfilter holder together, and said ring serving, when said intermediatepart has been clamped to the dust-container, as a sealing ring betweenthe latter two parts of the case of the vacuum cleaner.

4. A vacuum cleaner as delined in claim l, wherein the intermediate partand the filter holder are both provided at their tops with outwardlydirected ring anges which are enclosed by a ring consisting of ayieldable material, said ring clamping said intermediate part and saidfilter holder together, and -said ring, when said intermediate part isclamped together with said unit-carrying upper part of the vacuumcleaner, serves as sealing ring between said intermediate and upperparts of the case of the vacuum cleaner.

5. A vacuum cleaner as defined in claim l, wherein the filter membertapers downwardly towards the bottom and at its tapered end is closed bymeans of a closing plate.

6. A Vacuum cleaner as defined in claim l, wherein said filter bagmember is provided on the side facing said unit with means for turningsaid filter member inside out and shaking it and said filter holderbeing connected to at least one guiding member which serves to guide theintermediate part while it is being mounted on the dust container.

7. A vacuum cleaner as defined in claim l, wherein said filter holder isprovided with a guiding ange, the outside of said ange having a shapecorresponding to that of the inside of the portion of said intermediatepart enclosing the filter holder when the latter is connected with theintermediate part, said guiding ange on the ilter holder serving toguide the filter holder when the latter is being mounted on theintermediate part.

8. A vacuum cleaner as defined in claim 7, wherein the guiding memberprojects sufficiently far below the intermediate part that, when removedfrom the dust-container, the intermediate part can be pnt aside on a oorwithout the filter member touching said iioor.

9. A vacuum cleaner as defined in claim 1, further comprising a framecarried below said filter holder in depending position and carrying aplurality of upwardly-directed rods which carry at least one filtersupporting ring, so that said filter member is kept in' distended formin its operating position by resting on said filter supporting ring andby engagement with the bottom end of the unit-carrying upper part, aplate closing the bottom of the filter member and supporting saidbottom, and an upwardly-projecting shaking rod projecting upwardlythrough a hole in said filter holder and hole in said intermediate part,said shaking rod being movable vertically so that the frame with thesupporting ring can be shaken by motion of said shaking rod.

l0. A vacuum cleaner as defined in claim 9, wherein there are providedat least threeunit-carrying upper parts mounted in a circle, the centerof which lies in the axis ofthe shaking rod of the frame.

11. A vacuum cleaner as defined in claim 9, wherein there are providedtwo unit-carrying upper parts between which the shaking rod of the frameis mounted, said frame having when viewed from above the form of an H,the central bar of which is connected at its center to said shaking rod,and the two side bars of said H carry said upwardly-directed rods whichcarry twov supporting vrings for two filters.

12. A vacuum cleaner as defined in claim 9, wherein the depending frameis in its normal position supported by at least one pressure springwhich serves to keep the frame and the filter supporting ring carried bythe latter in their raised positions.

13. A vacuum cleaner as defined in claim 12, wherein said shaking rodhas a side projection and the pressure spring is mounted around theshaking rod of the frame with its upper end in engagement with said sideprojection, the lower end of the spring being in engagement with one ofthe parts provided with a hole through which the shaking rod projects.

14. A vacuum cleaner, comprising a vacuumand pressure-case formed fromat least one unit-carrying upper part, a filter-carrying intermediatepart, and a dust-con tainer into which the dust-filled air is sucked,said intermediate part being connected to a filter holder having atleast one air passage which is closed with a filter, and saidintermediate part being by releasable clamping means clampable in partwith said unit-carrying upper part, in part with said dust container,said filter holder being connected with at least one guiding memberwhich serves to guide the intermediate part while it is being mounted onthe dust-container, said guiding member projecting to a lesser extentbelow the intermediate part than the bottom of the filter which throughthe medium of the filter holder is connected to the intermediate part,

whereby after having been removed from the dust-container, theintermediate part can be put aside on the fioor, resting on the bottomof .said filter.

l5. A vacuum cleaner, comprising a vacuumand pressure-case formed fromat least one unit-carrying upper part, a filter-carrying intermediatepart, and a dustcontainer into wh-ich the dust-filled air is sucked,said intermediate part `being connected to a filter holder having atleast one air passage which is closed with a filter, and saidintermediate part being by releasable clamping mea-ns clampable in partwith said unit-carrying upper part, in vpart with said dust container,said intermediate part being connected to at least one guiding member,the outside of which has the shape of the inside of the upper part ofthe du-st container, and said guiding member serving for guiding theintermediate part while it is being mounted on the dust container, saidguiding member projecting to a lesser extent below the intermediate partthan the bottom of the filter which through the medium of the filterholder is `connected to the intermediate part, whereby after having beenremoved from the dust-container, the intermediate part can be put asideon the door, resting on the bottom of said filter.

16. A vacuum cleaner, comprising a vacuumand pressure-case formed fromat least one unit-carrying upper part, a filter-carrying intermediatepart, Aand a dustcontainer into which the dust-filled air is sucked,said intermediate part being connected to a filter holder having atleast one air passage which is closed with a filter, said filter being apartly bag-shaped and shakeable filter, and said intermediate part beingby releasable clamping means clampable 'in part with said unit-carryingupper part, in part with said dust container, said filter holder at saidat least one air passage, which is closed by a filter, having asupported device carrying a lter supporting ring whereby said filter ismaintained distended in its operating position in part by resting onsaid filter supporting ring and in part by the bottom `end of theunitcarrying upper part, the'motor and suction unit of which is partlyenclosed by said filter, supported on the bottom of the filter.

References Cited in the file of this 4patent UNITED STATES PATENTS1,010,388 Kirby Nov. 28, 1911 1,198,945l Moss Sept 19, 1916 2,091,137Carson Aug. 24, 1937 2,152,756 Billmyre Apr. 4, 1939 2,171,248 VanBerkel Aug. 29, 1939 2,192,357 Leathers Mar. 5, 1940 2,304,309 LeathersDec. 8, 1942 2,522,882 Lofgren Sept. 19, 1950 2,586,876 Sparklin Feb.26, 1952 FOREIGN PATENTS 387,405 Great Britain Feb. 9, 1933

